We have $(INSTALL_LIB) which is the same as $(INSTALL_PROG) but
uses correct permissions.  Loadable objects (modules) are like
shared libraries, not like programs.
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>
Cc: Fam Zheng <famz@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>